Spriggite

Spriggite is an uranyl hydroxide mineral with chemical formula Pb₃(UO₂)₆O₈(OH)₂·3H₂O. Its type locality is Mt Painter region, Arkaroola region, Flinders Ranges, South Australia. It was named after Reginald C. Sprigg (1919–1994).

Spriggite
General
Category	Uranyl hydroxide mineral
Formula	Pb3(UO2)6O8(OH)2·3H2O
IMA symbol	Sgg[1]
Strunz classification	4.GC.15
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	C2/c
Identification
Color	bright orange
Cleavage	distinct/ good on (100)
Fracture	irregular/ uneven
Tenacity	brittle
Mohs scale hardness	4
Luster	vitreous
Streak	pale orange
Diaphaneity	transparent
References	[2][3]